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Environment variable substitution in sed
...ote the entire string (which may make the statement more readable and less error prone).
So if you want to search for 'foo' and replace it with the content of $BAR, you can enclose the sed command in double-quotes.
sed 's/foo/$BAR/g'
sed "s/foo/$BAR/g"
In the first, $BAR will not expand correctl...
How can I catch a 404?
...on, specifically HttpStatusCode.NotFound
Something like:
HttpWebResponse errorResponse = we.Response as HttpWebResponse;
if (errorResponse.StatusCode == HttpStatusCode.NotFound) {
//
}
Where
we is a WebException.
share...
Find index of last occurrence of a substring in a string
... recent call last):
File "<stdin>", line 1, in <module>
ValueError: substring not found
The difference is when the substring is not found, rfind() returns -1 while rindex() raises an exception ValueError (Python2 link: ValueError).
If you do not want to check the rfind() return cod...
Xcode debugger doesn't print objects and shows nil, when they aren't
Xcode shows an error when trying to print an object with po <objectName> , but only for one project.
14 Answers
...
Calling startActivity() from outside of an Activity context
...
If you got error because of using create chooser like below:
Intent sharingIntent = new Intent(Intent.ACTION_VIEW);
sharingIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sharingIntent.setData(Uri.parse("http://google.com"));
startActi...
Getting HTTP code in PHP using curl
...nit('http://www.yahoo.com/');
// Execute
curl_exec($ch);
// Check if any error occurred
if(!curl_errno($ch))
{
$info = curl_getinfo($ch);
echo 'Took ' . $info['total_time'] . ' seconds to send a request to ' . $info['url'];
}
// Close handle
curl_close($ch);
...
Using G++ to compile multiple .cpp and .h files
...
Redefinition error arises when I use this approach? Is there another way of doing same?
– Waseem Ahmad Naeem
Dec 2 '17 at 15:04
...
How to convert a char to a String?
...enchmark Mode Cnt Score Error Units
CharToStringConversion.characterObjectToString thrpt 10 82132.021 ± 6841.497 ops/s
CharToStringConversion.characterToString thrpt 10 118232.069 ± 8242.847 ops/s
CharToStringConversion.concatBla...
What linux shell command returns a part of a string? [duplicate]
...ter:=use this and assign to param if param is null}
${parameter:?show this error if param is null}
They have more tweakable behaviours than those listed, and as I said, there are other ways to manipulate strings (a common one being $(command substitution) combined with sed or any other external fi...
How do I trim whitespace from a string?
...aces are removed
Instead use str.replace() to make more sense plus less error & more to the point.
The following code can generalize the use of str.replace()
def whitespace(words):
r=words.replace(' ','') # removes all whitespace
n=r.replace(',','|') # other uses of replace
retu...